A nut having a sleeve portion on its under side, which can be crimped or clinched to hold the item in place when inserted in a hole.
NSN 6220-01-367-0568
NSN 5920-00-670-4674
NSN 4140-01-052-5221
NSN 5855-00-198-3197
NSN 5855-01-042-7990
NSN 6220-01-225-2972
NSN 5975-01-023-6897
NSN 5985-00-682-7192
NSN 6240-00-313-2515
NSN 6320-01-495-0512
NSN 6105-00-726-8684
NSN 5950-01-129-3484